<template>
  <div class="nav">
    <nav-bar>
      <div slot="left" class="back" @click="backClick">
        <img src="~assets/img/common/back.svg" alt="">
      </div>
      <div slot="center" class="title">
        <div v-for="(item,index) in titles" 
             :key="item" class="title-item"
             :class="{active: index === currentIndex}"
             @click="titleClick(index)"
        >{{item}}</div>
      </div>
    </nav-bar>
  </div>
</template>

<script>
  import NavBar from 'components/common/navbar/NavBar'
  export default {
    components: {
      NavBar
    },
    data() {
      return {
        titles: ['商品','参数','评论','推荐'],
        currentIndex: 0
      }
    },
    methods: {
      titleClick(index) {
        this.currentIndex = index;
        this.$emit('titleClick',index)
      },
      backClick(){
        // this.$router.go(-1)
        this.$router.back()
      }
    }
  }
</script>

<style scoped>
  .nav{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
  }

  .back img{
    width: 18px;
    vertical-align: middle;
  }

  .title{
    font-size: 14px;
    display: flex;
  }

  .title-item{
    flex: 1;
  }

  .active{
    color: var(--color-high-text)
  }
</style>